CN103350192A - Novel water glass sand shell making technique for investment casting - Google Patents
Novel water glass sand shell making technique for investment casting Download PDFInfo
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- CN103350192A CN103350192A CN 201310256243 CN201310256243A CN103350192A CN 103350192 A CN103350192 A CN 103350192A CN 201310256243 CN201310256243 CN 201310256243 CN 201310256243 A CN201310256243 A CN 201310256243A CN 103350192 A CN103350192 A CN 103350192A
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Abstract
The invention discloses a novel water glass sand shell making technique for investment casting. The novel water glass sand shell making technique comprises the following steps: (1) smearing a surface layer; (2) smearing a transition layer; (3) smearing a third layer. The conventional water glass sand shell making technique is improved, special powder for precision casting and refining quartz sand are adopted, water glass and the special powder for precision casting are good in intersolubility, sizing agent flows smoothly, investment spreading mass is uniformly attached, the searing performance is good, and the stuccoing operability is good. The shell collapsibility after pouring is good, the surface roughness R of the casting is smaller than or equal to 6.3, and the surface quality and the dimensional accuracy of the casting are good.
Description
Technical field
The invention belongs to the model casting field, relate to a kind of process for making shell, be specifically related to the husky process for making shell of a kind of New Type Silicate for model casting.
Background technology
Model casting claims again " lost-wax casting ", typically refer at fusible material and make apperance, coat some layers of refractory material on the apperance surface and make shell, again shell is discharged in the apperance fusing, thereby obtain the casting mold without die joint, after high-temperature roasting, get final product the founding method of back-up sand cast.Because apperance extensively adopts wax material manufacturing, therefore often model casting is called " lost-wax casting ".
The alloy species that available investment casting is produced has carbon steel, steel alloy, heat-resisting alloy, stainless steel, Precise Alloy, permanent-magnet alloy, bearing metal, copper alloy, aluminium alloy, titanium alloy and spheroidal graphite cast-iron etc.The shape of investment-casting is more complicated all generally, and the castable minimum diameter that portals can reach 0.5mm on the foundry goods, and the minimum wall thickness (MINI W.) of foundry goods is 0.3mm.The parts that the several parts of some former causes can be combined aborning by changing the structure of part, are designed to one-piece parts and are directly cast out by model casting, to save the consumption of machining period and metal material, make design of part more reasonable.
According to statistics, shell material cost processed accounts for essence and casts this about 30%, and refractory material accounts for about 80% of shell material cost processed, and the material cost of surface layer accounts for 3/5ths of whole shell material cost processed.In addition, sodium silicate binder is general prepares slurry with silica flour, spread quartz sand, chemicosolidifying in ammonium chloride solution and crystal aluminum chloride solution, the investment shell intensity that this technique makes is not high, surface roughness and the dimensional accuracy of foundry goods are relatively poor, mostly are used for cast carbon steel and low, medium alloy steel foundry goods.In order to improve the surface quality of continuous castings of sodium silicate process, need the husky full form casting process of waterglass is improved.
Summary of the invention
Technical problem to be solved by this invention provides the husky process for making shell of the New Type Silicate that is used for model casting that a kind of surface quality of continuous castings is good, dimensional accuracy is high.
For solving the problems of the technologies described above, the technical scheme that Bian of the present invention uses is as follows:
The husky process for making shell of a kind of New Type Silicate for model casting, described process for making shell comprises the steps:
(1) be coated with float coat: the powder liquor ratio of slurry is essence casting tailored flour 325 orders: with slurry waterglass=l:2, the penetrating agent JFC that adds waterglass 0.06wt%, the defoamer that adds waterglass 0.04wt%, 34 ℃ of room temperatures, 29 ℃ of surface layer hothouse temperature, surface layer slurry viscosity number 14 S, sodium oxide content 2% in the surface layer slurry, surface layer spreads 40-70 order quartz sands, natural drying 20min before the surface layer sclerosis, the surface layer hardening bath is 24% ammonium chloride solution, and the surface layer firm time is 30 min, dry 100 min after the surface layer sclerosis;
(2) smear transition zone: slurry powder liquor ratio is silica flour 270 orders: with slurry waterglass=1:1.8, transition zone slurry viscosity value is 14～15 S, transition zone spreads 40-70 order quartz sands, natural drying 20min before the transition zone sclerosis, the transition zone hardening bath is 24% ammonium chloride solution, the transition zone firm time is 30 min, dry 100 min after the transition zone sclerosis;
(3) smear the 3rd layer: slurry powder liquor ratio is that fire clay 50%+ closes alms bowl powder 50%: waterglass=1:1.3～1.4, spread 8-12 orders and close alms bowl sand, adopt crystal aluminum chloride solution, its content is 6.7wt%, firm time is 30 min, be 40 min drying time after the sclerosis, and shell processed is complete, and module is placed to spend the night and got final product.
Wherein, the equal Bian of above-mentioned viscosity measures with the Chinese Industrial Standards (CIS) efflux cup method.
Compared with prior art, beneficial effect of the present invention is:
The present invention improves the husky process for making shell of the waterglass of routine, and Bian is with essence casting tailored flour and purity quartzite, and waterglass is good with the intersolubility of essence casting tailored flour, and the slurry trickling is smooth and easy, and the fusible pattern spreading mass adheres to evenly, is coated with that performance is good, the stucco operability is good.The shell collapsibility is good after the cast, surface roughness R≤6.3, and surface quality of continuous castings and dimensional accuracy are superior good.
The specific embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment only is used for helping to understand the present invention, should not be considered as concrete restriction of the present invention.
Specify such as nothing, various raw materials of the present invention all can obtain by commercially available; Or prepare according to the conventional method of this area.Unless otherwise defined or explanation, skillfully the meaning be familiar with of the person of entering is identical for all specialties used herein and scientific words and art technology.Any method similar or impartial to described content and material all can be applicable in the inventive method in addition.
Unless otherwise indicated, the meaning be familiar with scientific words and those skilled in the art of all specialties used herein is identical.Any method similar or impartial to described content and material all can be applicable in the inventive method in addition.
The husky process for making shell of a kind of New Type Silicate for model casting comprises the steps:
(1) be coated with float coat: the powder liquor ratio of slurry is essence casting tailored flour 325 orders: with slurry waterglass=l:2, the penetrating agent JFC that adds waterglass 0.06wt%, the defoamer that adds waterglass 0.04wt%, 34 ℃ of room temperatures, 29 ℃ of surface layer hothouse temperature, surface layer slurry viscosity number 14 S, sodium oxide content 2% in the surface layer slurry, surface layer spreads 40-70 order quartz sands, natural drying 20min before the surface layer sclerosis, the surface layer hardening bath is 24% ammonium chloride solution, and the surface layer firm time is 30 min, dry 100 min after the surface layer sclerosis;
(2) smear transition zone: slurry powder liquor ratio is silica flour 270 orders: with slurry waterglass=1:1.8, transition zone slurry viscosity value is 14～15 S, transition zone spreads 40-70 order quartz sands, natural drying 20min before the transition zone sclerosis, the transition zone hardening bath is 24% ammonium chloride solution, the transition zone firm time is 30 min, dry 100 min after the transition zone sclerosis;
(3) smear the 3rd layer: slurry powder liquor ratio is that fire clay 50%+ closes alms bowl powder 50%: waterglass=1:1.3～1.4, spread 8-12 orders and close alms bowl sand, adopt crystal aluminum chloride solution, its content is 6.7wt%, firm time is 30 min, be 40 min drying time after the sclerosis, and shell processed is complete, and module is placed and spent the night.
Carry out the hot water dewaxing, shell is dry 1 day after the dewaxing, then carries out roasting and cast again.
Process conditions and conventional water-glass sand process conditions by the present embodiment are poured into a mould respectively 1.4408 austenitic stainless steels, the surface roughness R of the foundry goods of the present embodiment preparation≤6.3;
Both accuracy comparisons such as following table:
Claims (2)
1. the husky process for making shell of New Type Silicate that is used for model casting is characterized in that, described process for making shell comprises the steps:
(1) float coat: the powder liquor ratio of slurry is essence casting tailored flour 325 orders: with slurry waterglass=l:2, the penetrating agent JFC that adds waterglass 0.06wt%, the defoamer that adds waterglass 0.04wt%, 34 ℃ of room temperatures, 29 ℃ of surface layer hothouse temperature, surface layer slurry viscosity number 14 S, sodium oxide content 2% in the surface layer slurry, surface layer spreads 40-70 order quartz sands, natural drying 20min before the surface layer sclerosis, the surface layer hardening bath is 24% ammonium chloride solution, and the surface layer firm time is 30 min, dry 100 min after the surface layer sclerosis;
(2) smear transition zone: slurry powder liquor ratio is silica flour 270 orders: with slurry waterglass=1:1.8, transition zone slurry viscosity value is 14～15 S, transition zone spreads 40-70 order quartz sands, natural drying 20min before the transition zone sclerosis, the transition zone hardening bath is 24% ammonium chloride solution, the transition zone firm time is 30 min, dry 100 min after the transition zone sclerosis;
(3) smear the 3rd layer: slurry powder liquor ratio is that fire clay 50%+ closes alms bowl powder 50%: waterglass=1:1.3～1.4, spread 8-12 orders and close alms bowl sand, adopt crystal aluminum chloride solution, its content is 6.7wt%, firm time is 30 min, be 40 min drying time after the sclerosis, and shell processed is complete, and module is placed to spend the night and got final product.
2. the husky process for making shell of a kind of New Type Silicate for model casting as claimed in claim 1 is characterized in that: the measurement of the equal Bian usefulness of described viscosity Chinese Industrial Standards (CIS) efflux cup method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201310256243 CN103350192A (en) | 2013-06-25 | 2013-06-25 | Novel water glass sand shell making technique for investment casting |
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| CN 201310256243 CN103350192A (en) | 2013-06-25 | 2013-06-25 | Novel water glass sand shell making technique for investment casting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103962512A (en) * | 2014-04-08 | 2014-08-06 | 湖南力神新材料科技有限公司 | Composite hardener for soluble glass shell manufacture adopting investment casting as well as preparation method of composite hardener |
| CN105798240A (en) * | 2016-04-27 | 2016-07-27 | 无锡环宇精密铸造有限公司 | Method for forming coal gangue sand for precision casting facing sand |
| CN109093071A (en) * | 2018-09-20 | 2018-12-28 | 天长市兴宇铸造有限公司 | A kind of casting of traction seat and treatment process |
-
2013
- 2013-06-25 CN CN 201310256243 patent/CN103350192A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103962512A (en) * | 2014-04-08 | 2014-08-06 | 湖南力神新材料科技有限公司 | Composite hardener for soluble glass shell manufacture adopting investment casting as well as preparation method of composite hardener |
| CN105798240A (en) * | 2016-04-27 | 2016-07-27 | 无锡环宇精密铸造有限公司 | Method for forming coal gangue sand for precision casting facing sand |
| CN109093071A (en) * | 2018-09-20 | 2018-12-28 | 天长市兴宇铸造有限公司 | A kind of casting of traction seat and treatment process |
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Application publication date: 20131016 |